Kerber, who offered up only a miserly seven free points, really just had to stay calm and wait for her opponent to self-destruct and Ostapenko fell into the trap.

Former world number one Kerber needed only 68 minutes to reach her fourth grand slam final.

The first game, served by Ostapenko, epitomised the match and illustrated just why the 21-year-old has become such a "must see" player on the WTA Tour and why watching American great Billie Jean King describes her style as "so much fun".

The old adage of feel your way in to a match and start solidly does not appear to apply to Ostapenko who put together a crazy sequence to start her first Wimbledon semi-final.

Kerber was under pressure straight away on her own serve and the match might have taken a different course if Ostapenko had not blazed a forehand long at 30-30 with the court gaping.

The left-hander had to save a break point, too, at 2-3 – conjuring an ace. But the match turned a game later.

Consecutive Ostapenko backhand errors handed 10th seed Kerber the first break and she proceeded to win seven of the next eight games basically by defending well and serving solidly to move into a 5-1 lead in the second set.

Such is the damage Ostapenko can do when her game clicks that even the biggest leads look fragile and, when she suddenly landed some telling blows to claw back two games, a turnaround did not seem out of the question.

Kerber looked worried and Ostapenko had a point to close to within a game but she dumped a backhand return into net and then coughed up two more errors to hand Kerber victory.

Kerber is now back in a grand slam title match for the first time since beating Karolina Pliskova in the 2016 US Open final – having started that year by stunning Serena Williams in the final of the Australian Open.

After suffering a drastic slump in 2017, ending the year ranked outside the top 20, Kerber is back where she feels she clearly belongs.